Automatic engraving-machine.



PATENTED MAY 17, 1904.

M. BARR. AUTOMATIC ENGRAVING MACHINE.

APPLICATION FILED APR. 1, 190 1.

2 BHEETS-SHBBT 1- N0 MODEL.

[Men/Z57" Maria .5 arr,

W/WMS.

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PATBN'I'ED MAY17, 1904.

M. BARR. AUTOMATIC EN GRAVIN G MACHINE.

APPLICATION FILED APR. 1, 1901.

N0 MODEL.

UNITED STATES Patented May 17, 1904.

PATENT .OEEIcE.

MARK BARR, OF KENSINGTON ENGLAND, ASSIGNOR TO THE LINOTYPE COMPANY,LIMITED, OF LONDON, ENGLAND.

AUTOMATIC ENGRAVlNG-IVIACHINE.

SPECIFICATION forming part of Letters Patent N0. 759,955, dated May 17,1904.

Application filed pril 1, 1901. Serial No. 53.911. (N0 model.)

To all whom it may concern:

Be it known that I, MARK BARR, residing at Clarendon road, Holland Parkavenue, Kensington, in the county of M iddlesex, England, have inventedcertain new and useful improvements in Automatic Engraving-Machines; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same. I

The present invention relates to improvements in automaticengraving-machines,and is specially applicable to machines for engravingdies for striking coins, medals, and the like. Its distinctive featureis a single straight rotating shaft, one end of which carries thepattern and the other end the work in planes at right angles with theaxis common to the three-shaft, pattern, and work. There are combinedwith the said shaft a novel linkage which carries the tracer or followerand the tool and communicates the motions of the former to the latter,means for adjusting the position of the shaft for ratio of reductionbetween the pattern and the work, means for alining the tracer and thetool axially with the shaft, means for the homologous adjustment of thetracer and the tool, and means for traversing the tracer and the toolradially over the pattern and the work, respectively.

Referring to the accompanying drawings, which are to be taken as part ofthis specification and read therewith, Figure 1 is a plan of theinvention; Fig. 2, an elevation of Fig. 1 looking at it in the directionof the arrow 2, and Fig. 3 an elevation of Fig. 1 looking at it in thedirection of the arrow 3.

1 is the single straight shaft above mentioned. 2 2 are its bearings, inwhich it can be rotated at the required speed.

3 is its driving-pulley. Means for driving the latter are not includedin the drawings because they do not constitute any part of the presentinvention and are, besides,well known. Any motor that can be quicklyreversed may be used.

4 is the pattern-block. It is mounted fast upon and to the respectiveend of the shaft 1 both pattern and work are carried by and rotate withthe shaft, one at one end thereof and the other at the other end, thepattern and work being in planes parallel with each other andperpendicular to the axis of the shaft and both facing in oppositedirections.

The linkage above mentioned consists of a rocker 9, a tracer arm orlever 10 of the first class, a tool arm or lever 11 of the second class,anda link 12. The rocker 9 is mounted to rock in bearings 13 13, carriedby the base 1a and upon which they stand in positions proper for holdingthe axis of the rocker 9 at an acute angle with. the shaft 1, the axisof the said rocker being in the same horizontal plane as the axis of thesaid shaft, the two axes intersecting each other in the center of thework 8.

15 is the tracer or follower. It is carried by one end of the lever 10,the axis of the tracer being preferably at right angles with the lengthof the lever. This latter has its fulcrum 16 in the rocker 9, near therespective end of it, as shown in Fig. 1, this fulcrum intersecting theaxis of the said rocker.

17 is the tool. It is carried by the lever 11, near one end of it, atthe same angle with that lever as the tracer 16 with the respectivelever 10. The lever 11 likewise has its fulcrum 18 in the rocker 9, nearthe respective end of it, as shown in Fig. 1, this fulcrum intersectingthe axis of the said rocker. The lever 10 extends beyond its fulcrum 16for a length equal to that of the lever 11, and the outer ends of bothare linked together by a link 12 of the proper length to maintain themparallel with each other, the link 12 being nec essarily parallel withthe axis of the rocker 9-.

The dimensional proportions between the pattern 5 and the work 8 are asthose between the distances of the fulcra 16 and 18 from the axis of theshaft 1. For adjusting those distances, or, in other words, foradjusting the ratio of reduction between the pattern and the work, theshaft 1 must be moved at right angles with its own axis to .or from thelinkage just described. Its bearings 2 2 are accordingly carried by aslide 20, capable of a reciprocating motion between a pair ofguide-strips 21 21 upon the base 14. This motion is imparted to it by atraversing screw 22, turning without axial motion in a bracketpiece 23,standing up from thebase 14 and engaging in a nut 24, fast on the slide20.

25 is a scale on one of the strips 21, and 26 its index on the slide 20.

27 is a milled head for turning the screw 22, 28 a micrometer-disk on itreading subdivisions of the scale 25, and 56 its index on thebracket-piece 23.

Let 2, equal minimumlength of tool-arm, L equal maximum length oftracer-arm, P equal the radius of the pattern 5, (:Z equal the radius ofthe work 8, and S equal the reading on the scale 25 to which the slide20 must be set, and when the machine stands set with the above lengthslet the slide 20 be at its Zero,

whence S equals 0 at this position-41.0., the above length relationshipis always coincident with the zero position of the slide. Now,

t-l- S ratio of reduction equals Therefore therefore, ratio of reductionequals also 25+ S I L S p v (ZL (ZS I Pt-l- PS (2 4 Pt rs as ZL Pt S (P+(Z) (Z L Pt I g If 5 equals 1 and L equals 15,

S 15(Z If After the shaft 1 has been adjusted the tracer 15 and the tool17 must both be moved along their respective levers 10 and 11 to alinetheir axes with that of the said shaft. To make such adjustmentspracticable,the tracer 15 is mounted in a tracer-block 57, adapted toslide in a slot 29 in the lever 10 and to be locked to the latter in theadjusted position by any suitable means, suchas locking-nuts 3O 30, thetool17 also being mounted in a tool-block 31, adapted to slide in a slot32 in the lever 11 and to be locked to the latter in the adjustedposition by locking-nuts 33 33. It is very probable that differentpattern-blocks 4 will be of different thicknesses, so that any one mayafter it has been mounted upon the respective end of the shaft 1 holdthe pattern 5 at a greater distance from the end of the said shaft thanwould another pattern-block hold its pattern. Hence it becomes necessarythat both the tracer 15 and the tool 17 should be adjustable in thedirection of their axes. For that purpose each one is capable of slidingthrough its blocks 57 31 and is fitted with a micrometer-adjustment 5455. The axial adjustments of the tool 17 are in all cases homologouswith those of the tracer 15.

The tracer may be moved over the pattern 5 either from the center to thecircumference or vice versa. It is so moved by the following means:

34 is an endless belt passed round a drivingpulley 35, fast on the shaft1, and a driven pulley 36, fast on the end of a vertical screw 37,adapted to turn only about its axis in a bearing 38 in the base 14 andone, 39, in the top of a vertical slotted guide 40, fast on the saidbase. V

41 41 are a pair of pulleys about which the belt 24 is led to be kepttight thereby. This tightening is effected by moving themaway from theshaft 1. Accordingly they are mounted to run loose upon a sleeve 42,which fits over a standard 43, having a foot 44 adjustable in a guide45, fast on the slide 20. They are locked in their adjusted position bya screw-threaded wing-nut 46, engaging the upstanding and screw-threadedend of the standard 43, and which when it is screwed down the saidstandard pinches the sleeve 42 between it and the guide 45.

47 is a screw-threaded nut on the screw 37 and capable of only onemotion a reciprocating vertical one in the guide 40. The length of thismotion in either direction is equal to the radius of the pattern 5. H i

48 is a horizontal cylinder incorporated along one of its sides with thenut in the way shown in Fig. 1. 49 is'a rod working through the closedend of it in the direction of the lever 10. The end of the latter isforked, the two prongs 5O 5O embracing the rod 49 be tween two collars51 51 fast thereon.

52 is a spring resilient between the inner end of the rod 49 and thenose of a set-screw 53, that works through the respective closed end ofthe cylinder 48. The function of the spring 52 is to keep the tracer 15and the tool 17 in working touch with the pattern 5 and the work 8,respectively, by rocking the levers 1O 11 on their fulcra 16 18,'Whilethat of the set-screw 53 is to regulate the strength of the said spring.

Referring to the part of the machine called the rocker '9, it must beunderstood that the invention does notlimit me, on the one hand, to therectangular open-frame shape shown in the figures and that, on the otherhand, some special conformation of this rocker 9 is necessary. It hasalready been explained clearly have the two levers 10 11 fulcrumed in itand to rock about an axis parallel with and in the same horizontal planeas the axis of the shaft 1. It must now be further explained that thetool 17, the work-block 7, and the respective end of the shaft 1, evenwhen the slide 20 is at its greatest distance from the rocker 9,surround the axis of the latter, as shown by the full lines of Fig. 1,which they could not do if the said rocker were not open or framed. Thefarthest forward position of the shaft 1 is indicated bythe dot-and-dashlines in Fig. 1, and the rocker 9 must obviously be shaped so as to makeroom for it.

The function of the linkage described above is to communicate the motionof the tracer homologously to the tool. Linkages for such a purpose arewell-known, the particular linkage shown is not claimed per se and maybe replaced by any other which is functionally the equivalent thereof.That being the case, the term linkage is to be understood in each of thefollowing claims which does not enumerate the several parts thereto asmeaning any linkage which is functionally the equivalent of theonedescribed in connection with the accompanying drawings, although itsconstruction may be different. SOuYVillll the means for traversing thetracer and the tool radially over the pattern and the work,respectively. Traversers for a similar purpose are not new, and theparticularone shown may be replaced by any other which is functionallythe equivalent thereof; That being the case, the means for traversingmentioned in each of the following claims which does not enumerate theseveral parts thereof are,

to be understood as meaning any means for traversing which isfunctionally the equivalent of the one described in connection with theaccompanying drawings, although its construction may be different.

1 claim 1. The combination of a single straight rotating shaft one endcarrying the pattern and the other end the work, in planes at rightangles with the axis common to the three, with a linkage carrying thetracer and the tool communicating the motions of the former homologouslyto the latter.

2. The combination of a single straight rotating shaft one end carryingthe pattern and the other end the work in planes at right angles withthe axis common to the three; a linkage carrying the tracer and the toolcommunicating the motions of the former homologously to the latter andmeans for adjusting the position of the said shaft in a direction atright angles with its own axis to or from the linkage.

3. The combination of a single straight rotating shaft one end carryingthe pattern and the-other end the work in planes at right angles withthe axis common to the three; a

linkage carrying the tracer and the tool communlcating the motions ofthe former homologo'usly to the latter and means for adjusting theposition of the said shaft in a direction at right angles with its ownaxis to or from the linkage; and means for traversing the tracer and thetool respectively over the pattern and the work between the center andthe circumference thereof.

4:. The combination of a single rotating shaft one end carrying thepattern and the other end the work in planes at right angles with theaxis common to the three; a linkage carrying the tracer and the toolcommunicating the motions of the former homologously to the latter;tracer and tool adjustable on the respective parts of the linkage; andmeans for adjusting the position of the said shaft in a direction atright angles with its own axis to or from the linkage.

5. The combination of a single rotating shaft one end carrying thepattern and the other end the work in planes at right angles with theaxis commonto the three; a linkage carrying the tracer and the toolcommunicating the motions of the former homologously to the latter;tracer and tool adjustable on the respective parts of theIlinkage; meansfor adjusting the position of the said shaft .in a direction at rightangles with its own axis to or from the linkage; and means fortraversing the tracer and the tool respectively over the pattern and thework between the respective center and circumference thereof.

6. The'eombination of a single rotating shaft one end carrying. thepattern and the other end the work in planes at right angles with theaxis common to the three; a linkage carrying the tracer and the toolcommunicating the motions of the former homologously to the latter;means for adjusting the position of the said shaft in a direction atright angles with its own axis to or from the linkage; independent meansfor axially alining the tracer and the tool with the shaft; each of thesaid means consisting of a slot in the respective lever of the linkage,a block adapted to slide therein lengthwise of the respective lever. anda locking device for holding the block in its adjusted position; andmeans for traversing the tracer and the tool respectively over thepattern and. the work between the respective center and circumferencethereof.

7. The combination of base; slide; single shaft carrying the pattern onone end of it and the work on theother end in planes at right angleswith the axis common to the three; hearings on the slide for the saidshaft; a linkage consisting of a rocker, a lever of the first classfulcrum ed therein and carrying the tracer at one end in contact withthe pattern, a lever of the second class fulcrumed likewise in the saidrocker and carrying the tool near its fulcrum in contact with the workand a link parallel with the rocker and connecting the outer ends of thelevers; tracer and tool adjustable on the respective parts of the link-Iio age; hearings on the base to carry the rocker with its axis parallelwith and in the same horizontal plane as the axis of the single shaft;means for adjusting the position of the said shaft in a direction atright angles with its own axis to or from the linkage; and means fortraversing the tracer and the tool respectively-over the pattern and thework be tween the respective center and circumference thereof. v

8. The combination of base; slide; single shaft carrying the pattern onone end of it and the work on the other end in planes at right angleswith the axis common to the three; bearings on the slide for the saidshaft; a linkage consisting of a rocker, a lever of the first classfulcrumed therein and carrying the tracer at one end in contact with thepattern, a lever of the second class fulcrumed in the said rockerlikewise and carrying the tool near its fulcrum and in contact with thework, and a link parallel with the rocker and linking-the outer ends ofthe said levers together; hearings on the base to carry the rocker withits axis parallel with and in the same horizontal plane as the axis ofthe shaft; and means consisting of a micrometer-screw turning in abracket on the base and engaging in a nut on the slide, a scale on theguide for the slide and an index on the latter reading with the saidscale, for adjusting the position of the said shaft in a direction atright angles with its own axis to and from the rocker of the linkage.

9. The combination of base; slide; single shaft carrying the pattern onone end of it and the work on the other end in planes at right angleswith the axis common to the three; bearings on the slide for the saidshaft; a linkage consisting of a rocker, a lever of the first classfulcrumed therein and carrying the tracer at one end in contact with thepattern, a lever of the second class fulcrumed in the said rockerlikewise and carrying the tool near its fulcrum and in contact with thework, and a link parallel with the rocker and linking the outer ends ofthe said levers together; bearings on the base to carry the rocker withits axis parallel with and in the same horizontal plane as the axis ofthe shaft; means consisting of a micrometer-screw turning in a bracketonthe base and engaging in a nut on the slide, a scale on the guide forthe slide and an index on the latter reading with the said scale, foradjusting the position of the said shaft in a direction at right angleswith its own axis to and from the 'rocker of the linkage; and means fortraversing the tracer and the tool respectively over the pattern and thework between the respective center and the circumference thereof,consisting of a driving-pulley on the said shaft, a screw turning infixed bearings on the base; a pulley fast on the said screw and drivenfrom the said driving-pulley, a traversing nut on the said screw, acylinder incorporated with the said nut, a spring-protruded rodprojecting from the said cylinder to engage with the linkage at the endof the lever that carries the tracer.

10. The combination of base; single shaft carrying the pattern on oneend of it and the Work on the other end in planes at right angles withthe axis common to the three; bearings in the slide for the shaft; alinkage consisting of a rocker, a lever of the first class fulcrumedtherein and carrying the tracer at one end in contact With the pattern,a lever of the second class fulcrumed in the said rocker likewise andcarrying the tool near its fulcrurn and in contact with the work, and alink parallel with the rocker and linking the outer ends of the saidlevers together; bearings on the base to carry the rocker with its axisparallel with and in the same horizontal plane as the axis of the shaft;means consisting of a micrometer-screw turning in a bracket on the onthe latter reading with the said scale, for

adjusting the position of the said shaft in a direction at right angleswith its own axis to and from the rocker of the linkage; means fortraversing the tracer and the tool respectively over the pattern and thework between the respective center and the circumference thereofconsisting of a driving-pulley in the said shaft, a screw turning infixed bearings on the base; a pulley fast on the said screw and drivenfrom the said driving-pulley, a traversing nut on the said screw, acylinder incorporated with the said nut, a spring-protruded rodprojecting beyond the said cylinder to engage with the linkage at theend of the lever that carries the tracer; and independent-means foraxially alining the tracer and the tool respectively With the axis ofthe shaft each of said means consisting of a slot in the respectivelever of the linkage, a block adapted to slide therein lengthwise of therespective lever and a locking device for holding the block in itsadjusted position.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

.. MARK BARR.

Witnesses: ROBERT E. MoLARuN, CHAs. S. VVOODROFFE.

